CN1211898C - Power generator, timepiece and electronic device and gear rotary torque regulating method - Google Patents

Abstract

Inner grooves (225A, 226A) for adjusting the cogging torque of the rotor are formed on the stator (22) in the small-volume power generator (20). Since the inner grooves (225A, 226A) are formed within an angle range of ±45° around the magnetic flux direction of the first magnetic circuit (100) having a smaller magnetic resistance with the rotation center of the rotor (21), the rotor is suitable for use. On the inner periphery of the matching hole (230), the cogging torque can be effectively reduced. Therefore, even when parts such as an oscillating weight and a strong spring are downsized to make a thin chronograph, the rotational stability of the rotor can be improved, thus improving the power generation efficiency of a small-sized power generator .

Description

Power generator, chronograph and electronic device, and cogging torque regulation method

technical field

The present invention relates to a power generator, a chronograph and an electronic device with the power generator, and a cogging torque adjustment method for the power generator, the power generator being suitable for a power supply of an electronic clock, and the like. More specifically, the present invention relates to techniques for optimizing the cogging torque (de-energizing torque/detent torque of a stepping motor) of a power generator.

Background technique

As shown in FIG. 1, a so-called electronic clock having a crystal oscillator as a time standard has a power supply 10 with a small-sized power generator 20 and a secondary power supply 30 that excites the stepping motors of the processor 14, etc. As shown in FIG. 2, a small-sized power generator 20 is equipped with a rotor 21 to be rotated by transmitted rotational driving force, a stator 22 sandwiched between the rotor 21, and a power generation coil 23 wound on a magnetic core, The magnetic core forms a magnetic circuit together with the stator 22 and the rotor 21 with a power generating gear train 60 for accelerating and transmitting the rotation of the oscillating pendulum 25 .

In order to keep the rotor 21 at a desired position when no load is applied, external grooves 221 and 222 are formed on the stator 22 for the magnetically saturated portion of the periphery of the rotor 21 as shown in FIG. 14 . The rotor 21 is a permanent magnet and has N and S poles. When the rotor is held at a certain angular position and the rotation of the oscillating pendulum 25 is transmitted to the power generating gear train 60 , the magnetic poles N and S are rotated to generate electromotive force for the power generating coil 23 . Since cogging torque is applied to the rotor 21, the rotor 21 is biased so as to maintain a predetermined angular position. (The rotor stop position where no load is applied. Hereinafter referred to as "unloaded rotor stop position".)

Therefore, the oscillating pendulum 25 must be able to transmit a torque greater than the cogging torque to the rotor 21 in order to rotate the rotor 21 .

However, since the size and thickness of each component of the electronic clock must be reduced to minimize the thickness of the electronic clock, the volume and weight of the oscillation pendulum 25 of the small-volume power generator 20 must be reduced. Therefore, for the conventional small-volume power generator 20, when the volume and weight of the oscillating pendulum 25 are reduced while the magnitude of the cogging torque applied to the rotor 21 remains unchanged, the rotation of the oscillating pendulum 25 will be hindered. , so the secondary power supply 30 cannot be charged,

In another type of power generator, the rotor of the power generator is rotated by means of mechanical energy, such as a strong spring. However, when the size of the strong spring etc. is reduced, the rotation of the rotor is hindered, thus causing the same problem when charging the secondary power supply.

Therefore, it is desirable to make the magnitude of the cogging torque as small as possible so that rotation of the rotor is facilitated even when the size of the oscillating pendulum 25 and the strong spring etc. are reduced.

Contents of the invention

An object of the present invention is to provide a power generator capable of effectively reducing the cogging torque applied to the rotor by improving the rotational stability of the rotor so that electric power can be efficiently generated, and to provide a chronograph and Electronic devices and methods for cogging torque regulation of power generators.

A power generator according to the present invention includes: a rotor having a permanent magnet rotated by means of transmitted rotational driving force; a stator having a rotor fitting hole for placing the rotor; and a power generating coil wound on the magnetic core, The magnetic core together with the stator and the rotor form a magnetic circuit in which the reluctance of a first magnetic circuit extending from the rotor to the stator and the core back to the rotor and a second magnetic circuit whose flux is closed around the stator adjacent to the rotor is possible In comparison, no inner groove is formed on the inner periphery of the rotor fitting hole, wherein when the reluctance of the first magnetic circuit is small, at ±45° centered on the magnetic flux direction of the rotor rotation center of the first magnetic circuit An inner groove is formed on the inner periphery of the rotor fitting hole of the stator within an angle range of , and wherein when the reluctance of the second magnetic circuit is small, the magnetic flux direction centered on the rotor rotation center of the second magnetic circuit An inner groove is formed on the inner periphery of the rotor fitting hole of the stator within an angular range of ±45°.

In the present invention, the inner groove is not limited to a cut portion formed on the inner periphery of the rotor fitting hole, but may be an indentation (reducing the thickness of a part of the rotor) on the inner periphery of the rotor fitting hole, Or alternatively, there may be a hole formed near the inner periphery of the rotor fitting hole (a through hole penetrating the rotor in the thickness direction). In other words, for the inner groove, any arrangement is possible as long as the inner groove can extend a part of the gap between the rotor and the inner periphery of the rotor fitting hole, or provide a through hole to the magnetic circuit for adjusting the magnetic The magnetic resistance of the road.

When the stator is divided at the rotor fitting hole section, the first magnetic circuit starts from the rotor (magnet) through one of the stators and the magnetic core to the other stator, and back to the rotor. Also, when the stator is integrally formed without being divided, the first magnetic circuit starts from the rotor through the stator and the magnetic core on one side of the rotor to the other side of the stator, and back to the rotor. The magnetic flux direction at the rotor rotation center of the second magnetic circuit (hereinafter referred to as the second magnetic circuit direction) is the direction of the second magnetic circuit whose magnetic flux closes around the rotor at the stator, and it is generally the same as that at the first A direction orthogonal to the direction of the magnetic flux at the rotor rotation center of the magnetic circuit (hereinafter referred to as the first magnetic circuit direction).

The cogging torque of the main first magnetic circuit and the second magnetic circuit whose flux is closed around the rotor is applied to the rotor. Since the individual magnetic circuits generally intersect perpendicularly at the rotor segment, the magnetic circuit exerting a strong magnetic attraction force due to the high magnetic flux density, ie, the magnetic circuit having a small reluctance exerts a large influence. Therefore, by enlarging the gap between the rotor and the stator by forming an inner groove in a magnetic circuit with a small reluctance to increase the reluctance, the magnetic attraction force applied to the rotor, that is, the cogging torque can be decrease. Therefore, even when the volume and weight of the oscillating pendulum or the powerful spring are reduced by reducing the thickness of the device, power can be efficiently generated, and the secondary power source can be efficiently charged. Moreover, since the cogging torque of the rotor can be reduced when a strong spring is used, the duration of the strong spring can be lengthened for a strong spring of the same size, so that the power generator can work for a longer period of time.

By the way, when the inner groove is arranged outside the position deviated by ±45° relative to the first or second magnetic circuit direction with smaller magnetic resistance, the first or second magnetic circuit direction with smaller magnetic resistance The reluctance will not be increased by the inner groove, so the cogging torque will not be reduced. Therefore, the inner groove must be formed within an angle range of ±45° around the direction of the magnetic circuit with less magnetic resistance.

In another aspect of the present invention, a power generator includes: a rotor having a permanent magnet rotating by means of a transmitted rotational driving force; a stator having a rotor fitting hole for placing the rotor; and a power coil wound on a magnetic core. The coil is produced, and the magnetic core constitutes a magnetic circuit together with the stator and the rotor, wherein when no inner groove is formed on the inner periphery of the rotor fitting hole of the stator, the first magnetic circuit (extending from the rotor through the stator and the magnetic core back to the rotor ) is set to be smaller than the reluctance of the second magnetic circuit whose magnetic flux is closed around the stator adjacent to the rotor, and where ±45° centered on the flux direction of the rotor rotation center of the first magnetic circuit An inner groove is formed on the inner periphery of the rotor fitting hole of the stator within an angular range of .

In still another aspect of the present invention, a power generator includes: a rotor having a permanent magnet rotating by means of a transmitted rotational driving force; a stator having a rotor fitting hole for placing the rotor; and a power coil wound on a magnetic core. The coil is produced, and the magnetic core together with the stator and the rotor constitutes a magnetic circuit, wherein when no inner groove is formed on the inner periphery of the rotor fitting hole of the stator, its magnetic flux surrounds the second magnetic circuit closed by the stator adjacent to the rotor The reluctance of is set to be smaller than the reluctance of the first magnetic circuit (extending from the rotor through the stator and the magnetic core back to the rotor), and wherein the magnetic flux direction of the rotor rotation center of the second magnetic circuit is within ±45° An inner groove is formed on the inner periphery of the rotor fitting hole of the stator within an angular range of .

According to the above power generator, the cogging torque applied to the rotor can be effectively reduced by forming an inner groove on the magnetic path of the magnetic circuit having a smaller magnetic resistance in the middle of the two magnetic circuits , so that even when the volume and weight of the oscillating pendulum or the powerful spring are reduced by reducing the thickness of the device, power can be efficiently generated, and the secondary power source can be efficiently charged.

In the above arrangement, the inner groove may preferably be formed within an angular range of ±10° centered on the magnetic flux direction of the rotation center of the rotor of the first magnetic circuit or the second magnetic circuit. Therefore, the cogging torque can be further effectively reduced compared to a wider angular range arrangement.

Also, the inner groove may preferably be formed in a magnetic flux direction with a rotation center of the rotor of the first magnetic circuit or the second magnetic circuit. Therefore, the cogging torque can be reduced most efficiently. Furthermore, the size of the inner groove can be reduced by effectively reducing the cogging torque.

In yet another aspect of the present invention, a power generator includes: a rotor having a permanent magnet rotating by means of a transmitted rotational driving force; a stator having a rotor fitting hole for placing the rotor; and a power coil wound on a magnetic core. Coils are produced, the cores together with the stator and the rotor form a magnetic circuit, where a first magnetic circuit extending from the rotor to the stator and the core back to the rotor and a second magnetic circuit whose flux surrounds the stator adjacent to the rotor closes Resistance is compared without forming protrusions on the inner periphery of the rotor fitting hole, where when the reluctance of the first magnetic circuit is large, the magnetic flux direction centered on the rotation center of the rotor of the first magnetic circuit Within the angular range of ±45°, a protrusion extending toward the rotor is formed on the inner periphery of the rotor fitting hole of the stator, and wherein when the reluctance of the second magnetic circuit is large, in the second magnetic circuit A protrusion extending toward the rotor is formed on the inner periphery of the rotor fitting hole of the stator within an angular range of ±45° centered on the magnetic flux direction of the rotation center of the rotor.

In the present invention, any protrusion may be used as long as the gap between the rotor and the inner periphery of the fitting hole of the rotor can be partially reduced, thereby adjusting the reluctance of the magnetic circuit.

The cogging torque of the main first magnetic circuit and the second magnetic circuit whose flux is closed around the rotor is applied to the rotor. Since the individual magnetic circuits generally cross perpendicularly at the rotor segments, the balance of the magnetic flux density, that is, the balance between the reluctances of the individual magnetic circuits is greatly affected. Therefore, the gap between the rotor and the stator is reduced by forming a protrusion in the magnetic circuit having a large reluctance in order to reduce the reluctance, the magnetic attraction force applied to the rotor, that is, the cogging torque The total can be reduced. Therefore, even when the volume and weight of the oscillating pendulum or the powerful spring are reduced by reducing the thickness of the device, power can be efficiently generated, and the secondary power source can be efficiently charged. Moreover, since the cogging torque of the rotor can be reduced when a strong spring is used, the duration of the strong spring can be lengthened for a strong spring of the same size, so that the power generator can work for a longer period of time.

Incidentally, the projections may be arranged at an angle of ±45° centered on the magnetic flux direction of the rotation center of the rotor of the first magnetic circuit or the second magnetic circuit having a larger reluctance like the inner groove. within range. Considering the cogging torque reduction effect, the angle range is preferably within ±10°, and this effect can be maximized by forming a protrusion in the direction of the maximum magnetic flux.

The power generator may preferably further include: an oscillating pendulum for rotating together with user's body motion; and a power generating gear train for rotating the rotor by transmitting the rotation of the oscillating pendulum to the rotor.

Although the rotational driving force for rotating the rotor can be applied by mechanical energy sources such as strong springs, rubbers, springs, and eccentric pendulums, an oscillating pendulum that rotates with the user's human body motions can be preferably used because only by putting the power The generator is attached to the human body without caring about it, and the rotor can be rotated conveniently.

A chronograph according to the present invention has the above power generator, and a processor for time display by electric energy generated by the power generator.

A chronograph with a power generator can effectively reduce the cogging torque applied to the rotor, so that even when the size and weight of the oscillating pendulum and the powerful spring are reduced due to the reduced thickness of the device, the power is still available is efficiently generated, and secondary power can be efficiently charged, and thus can be applied to small-sized chronographs such as watches.

An electronic device according to the present invention has the above power generator, and a processor for time display of electric energy generated by the power generator. Such electronic devices include cellular phones, PHS (Personal Handyphone System), car and house keys (including processors for light and keyless entry), radios, personal computers, calculators, IC cards, and the like. The present invention can be suitably applied to small-sized portable electronic devices.

A cogging torque adjustment method according to the present invention is for a power generator comprising: a rotor with permanent magnets rotating by means of transmitted rotational driving force; a stator with a the rotor fitting holes; and the power generating coils wound on the magnetic core which, together with the stator and the rotor, constitute the magnetic circuit. The method has the steps of: comparing the first magnetic circuit extending from the rotor to the stator and the magnetic core back to the rotor and its flux around the The reluctance of the second magnetic circuit with the stator closed; when the reluctance of the first magnetic circuit is small, within the angle range of ±45° centered on the magnetic flux direction of the rotation center of the rotor of the first magnetic circuit, in the stator Inner grooves are formed on the inner periphery of the rotor fitting hole; and when the reluctance of the second magnetic circuit is small, within the angular range of ±45° centered on the magnetic flux direction of the rotation center of the rotor of the second magnetic circuit Inside, an inner groove is formed on the inner periphery of the rotor fitting hole of the stator.

Another cogging torque adjustment method according to the present invention is for a power generator comprising: a rotor having a permanent magnet rotating by means of a transmitted rotational driving force; a stator having a and a power generating coil wound on a magnetic core, the magnetic core constitutes a magnetic circuit together with the stator and the rotor, the method comprising the steps of: When the object, the reluctance of the first magnetic circuit extending from the rotor to the stator and the magnetic core back to the rotor and the second magnetic circuit whose flux surrounds the closed stator adjacent to the rotor; when the reluctance of the first magnetic circuit is large , within an angle range of ±45° centered on the magnetic flux direction of the rotation center of the rotor of the first magnetic circuit, a protrusion extending toward the rotor is formed on the inner periphery of the rotor fitting hole of the stator; and when When the reluctance of the second magnetic circuit is relatively large, within the angle range of ±45° centered on the magnetic flux direction of the rotation center of the rotor of the second magnetic circuit, it extends toward the inner periphery of the rotor fitting hole of the stator. Rotor protrusions.

In the above cogging torque adjustment method of a power generator, the arrangement of the stator and the rotor has been described so far, and the arrangement of the inner groove and the protrusion has also been described.

According to the cogging torque method of the present invention, the cogging torque can be effectively reduced.

Description of drawings

1 is a block diagram showing an overview of the entire structure of a chronograph having a power generator embodying the present invention in a power supply;

FIG. 2 is a perspective view showing an outline of the entire structure of an analog electronic clock as an example of a chronograph;

3 is a plan view showing a main part of a power generator according to a first embodiment of the present invention;

FIG. 4 is an explanatory diagram showing an example of the arrangement of inner grooves of the power generator shown in FIG. 3;

5 is a plan view showing a main part of a power generator according to a second embodiment of the present invention;

FIG. 6 is an explanatory diagram showing an example of the arrangement of inner grooves of the power generator shown in FIG. 5;

Figure 7 is a cross-sectional view showing a modification of the inner groove according to the present invention;

Fig. 8 is an explanatory diagram showing another modification of the inner groove according to the present invention;

Figure 9 is a plan view showing another modification of the present invention having protrusions;

10 is a graph showing the relationship between the rotation angle of the rotor and the cogging torque according to the experiment of the present invention;

11 is a graph showing the relationship between the rotation angle of the rotor and the cogging torque according to the experiments of the present invention;

12 is a graph showing the relationship between the rotation angle of the rotor and the cogging torque according to the experiments of the present invention;

13 is a graph showing the relationship between the preset angle of the inner groove and the cogging torque according to the experiment of the present invention;

Fig. 14 is a plan view showing a conventional small-volume power generator.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[whole package]

Figure 1 is a generalized scheme of an electronic device with a power generator embodying the invention.

The chronograph according to the present invention has a power source 10 including a small-sized power generator 20, a rectifier 51 for rectifying the AC current output from the power generator 20, and a storage circuit 12 for storing the current rectified by the rectifier 11. Furthermore, the chronograph 1 has a processor 14 for clocking and displaying the time with electric power obtained from the power generator 20 .

In addition to clock keeping and time display functions, processor 14 may have functions such as radio, pager and personal computer. Although a capacitor may be used for the storage circuit 12, any secondary power source having power storage capability, such as a secondary battery, may also be used. The rectifier 11 is not limited to a full-wave rectifier using the diode 113, but may be a half-wave rectifier, or may be a rectifier using an inverter, or the like.

In the following description, a portable chronograph (wrist watch) having an analog electronic clock as a processor is taken as an example. Incidentally, among the respective elements of the power generator 20, parts having common functions with conventional power generators will be attached with the same reference numerals.

In FIG. 2 , the electronic clock on the chronograph of the present invention is an analog quartz watch with an analog display in which a stepping motor 40 is driven according to a signal sent from a crystal oscillator 32 on a circuit board 31 . The stepping motor 40 includes a motor rotor 42 made of permanent magnets magnetized at two poles, a motor stator 43 having a cylindrical rotor fitting hole 430 for placing the motor rotor 42, and a coil block made of a magnetic core 44 and The coil 41 that is wound on it is made.

A clock gear chain 50 consisting of a fifth gear train 51, a scanning gear train 52, a third gear train 53, a sun gear and pinion minute gear 55, and an hour gear 56 is connected to the motor rotor 42 through a pinion . The seconds hand 161 is mounted to the end of the pivot of the scan gear train 52 . Minute hand 162 is fixed to the cylindrical shaft of sun gear train 54 . And the hour hand 163 is fixed to the cylindrical shaft of the hour gear 56 . The reduction ratio from motor rotor 42 to scan gear train 52 is 1/30. The second hand 161 rotates intermittently by 6° in accordance with the intermittent rotation of the motor at 180° per second.

[Small-sized power generator solution for power supply]

The power source 10 for driving the stepping motor 40 is mainly composed of a small-sized power generator 20 and a secondary power source (capacitor) 30 . The small-sized power generator 20 has an oscillating pendulum 25 rotated by the movement of the arm, a rotor 21 rotated by receiving kinetic energy from the oscillating pendulum 25, a stator 22 of the sandwich rotor 21, and a power coil wound on a magnetic core 27. The coil 23 is generated, and the magnetic core 27 constitutes a magnetic circuit together with the stator 22 and the rotor 21 . The oscillating weight 25 and the rotor 21 are mechanically connected by a power generating gear train 60 for accelerating and transmitting the rotation of the oscillating weight 25, the power generating gear train 60 comprising a gear plate 61 integrally formed with the oscillating weight 25, and transmission The gear 62 has a pinion that meshes with the gear plate 61 .

As shown in FIG. 3 , a rotor fitting hole 230 for placing the rotor 21 is provided on the stator 22 . A first magnetic circuit (main magnetic circuit) 100 passing through the stator 22 and the magnetic core 27 is formed in a ring shape passing through the rotor 21 . In other words, the first magnetic circuit 100 starts from the rotor 21 , passes through one side of the stator 22 , the magnetic core 27 and the other end of the stator 22 , and returns to the rotor 21 .

Outer grooves 221 and 222 for forming a pair of magnetically saturated portions on the periphery of the rotor 21 are formed on both sides of the stator, placed orthogonally to the first magnetic circuit 100 with respect to the rotation center O.

The rotor 21 is a cylindrical permanent magnet having two magnetic poles N and S for equally spacing the circumference of the rotor 21 . When the magnetic poles N and S rotate when the rotation of the oscillating pendulum 25 is transmitted, induced electromotive force can be obtained from the power generating coil 23 , thereby charging the secondary power supply 30 .

Since the cogging torque is applied to the rotor 21 through the first magnetic circuit 100 and the second magnetic circuit 101 whose magnetic flux is closed at the stator 22 close to the rotor 21, the rotor 21 is biased to maintain a certain angular position (unloaded rotor stop position).

Incidentally, the rotor 21 is driven to rotate by the torque from the oscillating pendulum 25 which rotates according to the wall motion. However, the volume and weight of the oscillating pendulum 25 become reduced in accordance with the reduction in thickness of the analog electronic timepiece 1 . Therefore, when the volume and weight of the oscillating pendulum 25 are reduced in the conventional small-volume power generator, the rotational stability of the rotor will decrease because the torque from the oscillating pendulum 25 is applied to the cogging of the rotor 21. The effect torque will decrease while remaining constant.

[first embodiment]

Therefore, in this embodiment, inner grooves 225A and 226A are provided on the stator 22 for adjusting the cogging torque, as shown in FIG. 3, thus reducing the cogging torque and improving the power generator efficiency.

In the present embodiment, the material, area and gap size of each stator 22 and the connecting portion of the magnetic core 27 are arranged so that, when the inner grooves 225A and 226A are not formed, as shown by the double-dotted line in FIG. The reluctance of the second magnetic circuit 101 extending from the rotor 21 and the stator 22 close to the rotor 21 and closed at the part of the stator 22 is greater than that extending from the rotor through the stator 22, the magnetic core 27 and the The stator 22 returns to the reluctance of the first magnetic circuit 100 of the rotor 21 .

Incidentally, the size of the respective magnetic circuits 100 and 101 can be specifically adjusted by the presence and size of the gap of the connecting portion of the stator 22 and the magnetic core 27 .

Also, the materials of the rotor 21, the stator 22, and the magnetic core 27 can be appropriately selected. For example, various permanent magnets, such as samarium cobalt sintered magnets, can be used for the rotor 21 , and permalloy (PB and PC materials) can be used for the stator 22 and the magnetic core 27 .

In this embodiment, the magnetic poles N and S of the permanent magnets of the rotor 21 are in the direction for relaxing the magnetic poles N and S in the first magnetic circuit direction (shown by arrow 100A in FIG. A cogging torque is applied in a direction perpendicular to the direction connecting the outer grooves 221 and 222 to attract the magnetic poles N and S. The position of the rotor 21 to be unclamped by the cogging torque is the no-load rotor stop position.

In the present embodiment, in order to reduce the cogging torque, inner grooves 225A and 226A for adjusting the cogging torque are recessed on the inner periphery of the rotor fitting hole 230 . Specifically, the inner grooves 225A and 226A are arranged such that the direction extending from the rotation center of the rotor 21 to the inner grooves 225A and 226A is within an angular range of ±45° around the 100A direction (first magnetic circuit direction) of the arrow. Within, more specifically, precisely in the first magnetic circuit direction. Incidentally, fluctuations within an angular range of about ±5° may be caused due to manufacturing errors.

The inner grooves 225A and 226A may be recessed trapezoidally or triangularly, and any configuration is possible. In the present embodiment, the grooves 225A and 226A are hemispherically recessed on the inner periphery of the rotor fitting hole 230 .

Incidentally, the reduction ratio of the cogging torque applied to the rotor 21 can be adjusted by the position, size and configuration of the cogging torque adjusting inner grooves 225A and 226A.

Therefore, although in general, each inner groove 225A and 226A is preferably formed along the first magnetic circuit direction 100A, as shown in FIGS. The slot 225A may be moved clockwise (in the CW direction) by a predetermined angle (for example, 20°) with respect to the first magnetic circuit direction 100A, and a second cogging torque-adjusting inner groove 226A may be formed at a distance from the first magnetic circuit direction 100A. The position of the inner groove 225A is shifted by 180°.

Alternatively, as shown in FIG. 4(C), the second inner groove 226A for adjusting the cogging torque may be moved clockwise by a predetermined angle (for example, 20°) relative to the first magnetic circuit direction 100A, And the first inner groove 225A for adjusting the cogging torque may be formed at a position shifted clockwise by 140° from the second inner groove 226A.

In other words, the inner grooves 225A and 226A may be formed within an angle range of ±45° around the rotor rotation center with respect to the first magnetic circuit direction 100A. For example, the angle may be set to ±45°, ±30°, ±20°, ±10°, ±0°, etc. relative to the first magnetic circuit direction 100A. In order to effectively adjust the cogging torque, the angle is preferably as small as possible.

By forming the inner grooves 225A and 226A, the gap between the rotor 21 and the stator 22 is enlarged at the grooves. Accordingly, the reluctance of the first magnetic circuit 100 , which originally had a reluctance smaller than that of the second magnetic circuit 101 , can be increased, thus reducing the cogging torque applied to the rotor 21 .

[Main effects of the present embodiment]

According to the present embodiment, since the inner grooves 225A and 226A are formed between the first magnetic circuit 100 and the second magnetic circuit 101, at the rotation center of the rotor 21, the first magnetic circuit 100 which originally has a smaller magnetic resistance With the magnetic flux direction 100A, the cogging torque applied to the rotor 21 can be effectively reduced.

Therefore, although the unbalance amount of the oscillating pendulum 25 is reduced as the volume of the small-sized power generator 20 is reduced, since the cogging torque applied to the rotor 21 can also be reduced, the rotation of the rotor 21 is stabilized. The stability can be improved so that the rotor 21 can be driven to rotate by slight wall motion, which enables the power generation system to work efficiently.

Also, the reduction of the cogging torque can be adjusted by the position, size and configuration of the inner grooves 225A and 226A for adjusting the cogging torque. Therefore, even when the volume and weight of the oscillating pendulum 25 are reduced by reducing the thickness of the analog electronic clock 1, power can be efficiently generated by the small-sized power generator 20, so that it is possible to generate power only by forming The volume and weight of the hammer 25 are reduced by the number, location, size and configuration of the internal grooves 225A and 226A to effectively charge the secondary power source 30 .

[Second embodiment]

A second embodiment of the present invention will be described below with reference to FIGS. 5 and 6 .

Incidentally, in the following embodiments and modifications, the same reference numerals as those of the first embodiment will be attached to the same or similar components in order to simplify or omit their descriptions.

In this embodiment, the materials, areas and gaps of the connecting parts of the respective electrons 22 and the magnetic core 27 are arranged so that, when the inner grooves 225A and 226A are not formed, as shown by the double-dotted line in FIG. The reluctance of the second magnetic circuit 101 where the flux closes at the stator 22 close to the rotor 21 is less than the reluctance of the first magnetic circuit 100 extending from the stator 22 through the magnetic core 27 and back to the stator 22 as shown by the single-dotted line. resistance.

Therefore, the magnetic poles N and S of the permanent magnets of the rotor 21 are used to maintain the magnetic poles N and S in the second magnetic circuit direction (direction shown by arrow 101A in FIG. 5 perpendicular to the first magnetic circuit direction 100A). , that is, cogging torque is applied in a direction for attracting the magnetic poles N and S in a direction connecting the outer grooves 221 and 222 . The position where the rotor 21 is to be released by the cogging torque is the no-load rotor stop position in this embodiment.

In the present embodiment, in order to reduce the cogging torque, inner grooves 225A and 226A for adjusting the cogging torque are recessed on the inner periphery of the rotor fitting hole 230 . Specifically, the inner grooves 225A and 226A are arranged such that the direction extending from the rotation center O of the rotor 21 to the inner grooves 225A and 226A is at an angle of ±45° around the 101A direction (second magnetic circuit direction) of the arrow. range, more specifically, precisely in the direction of the second magnetic circuit. Incidentally, fluctuations within an angular range of about ±5° may be caused due to manufacturing errors.

Although in general, each inner groove 225A and 226A is preferably formed along the second magnetic circuit direction 101A, as shown in FIGS. 5 and 6(A), the first inner groove for adjusting the cogging torque The slot 225A may be moved clockwise by a predetermined angle (for example, 20°) with respect to the second magnetic circuit direction 101A, and a second inner groove 226A for adjusting cogging torque may be formed from the first inner groove. 225A moves 180° on the position.

Alternatively, as shown in FIG. 6(B), the second inner groove 226A for adjusting the cogging torque may be moved clockwise (in the CW direction) relative to the second magnetic circuit direction 101A by a predetermined angle (eg , 20°), and the first inner groove 225A for adjusting the cogging torque may be formed at a position shifted 140° clockwise from the second inner groove 226A.

By forming the inner grooves 225A and 226A, the gap between the rotor 21 and the stator 22 is enlarged at the grooves. Accordingly, the reluctance of the second magnetic circuit 101 , which originally had a reluctance smaller than that of the first magnetic circuit 100 , can be increased, thus reducing the cogging torque applied to the rotor 21 .

According to this embodiment, the same functions and effects as those of the first embodiment can be obtained.

[fix]

Incidentally, the scope of the present invention is not limited to the above respective embodiments but includes other arrangements, and it includes the following modifications as long as other objects of the present invention can be achieved.

For example, the arrangement structure of the inner grooves 225A and 226A for adjusting the cogging torque is not limited to a hemispherical shape, but may be a trapezoidal shape as shown in FIGS. 6(A) and (B), or alternatively, an approximate triangular shape. , square or other polygons. In addition, by forming a trapezoidal or square inner groove as shown in Fig. 6, since the groove has a constant thickness within a certain angle, the position shift of the groove does not have much influence on the first cogging torque , even when the position of the inner groove at the stator 22 is slightly shifted, so that the cogging torque can be stably adjusted.

Also, the inner groove may be formed by reducing the thickness of the stator 22 to form a depression 240 on a part of the inner periphery of the rotor fitting hole 230, as shown in FIG. 7 . Alternatively, as shown in FIG. 8 , an inner groove may be provided as a hole 250 penetrating the stator 22 in the thickness direction near the inner periphery of the rotor fitting hole 230 . In other words, for the inner groove, any configuration structure is possible as long as the slit in the orthogonal can be locally enlarged, or the reluctance of the magnetic circuits 100 and 101 can be adjusted by providing a through hole in the magnetic circuit .

Moreover, in the present invention, the reluctance of each magnetic circuit 100 and 101 may not necessarily be balanced by forming an inner groove as in the above embodiments, but the protrusion 260 as shown in FIG. formed to balance the reluctance. Specifically, the reluctances of the respective reluctances 100 and 101 may be adjusted by the size of the gap between the rotor 21 and the stator 22 . Therefore, instead of forming the inner groove in the direction of the magnetic circuit having a smaller magnetic resistance in order to increase the magnetic resistance with respect to other magnetic circuits, a protrusion may be formed in the direction of a magnetic circuit having a larger magnetic resistance. 260, in order to reduce the reluctance compared with other magnetic circuits, so as to adjust the balance of reluctance. In other words, forming the protrusion 260 in the direction of the magnetic circuit with a larger magnetic resistance has the same effect as forming the inner groove in the direction of the magnetic circuit with a smaller magnetic resistance, so that each magnetic circuit The difference between reluctances can be reduced for balance adjustment. Therefore, the same function and effect as the above-mentioned embodiment can be achieved by forming the protrusion 260 .

Also, although the stator 22 of the above-described embodiment is of a unitary type, a two-piece type stator composed of two stator materials placed as a sandwich rotor 21 may also be used. In this arrangement, inner grooves may also be formed on the first magnetic circuit 100 or the second magnetic circuit 101 having a smaller magnetic resistance.

Also, although the above embodiments relate to the self-winding type in which the rotor 21 is rotated by the oscillating pendulum 25, the present invention can be applied to the artificial winding type for manually rotating the rotor 21 by the crown gear. When the cogging torque applied to the rotor 21 is reduced in the hand winding type, power can be efficiently generated through the small crown gear.

Moreover, the rotor 21 can be transmitted from mechanical energy sources such as strong springs, rubbers, springs, and eccentric pendulums, through mechanical energy transmission devices such as gear chains (gear discs), friction gears, belts and pulleys, chains and sprockets, racks, etc. Gears, cams, etc. transmit mechanical energy to be rotated.

The number of inner grooves, positions within a predetermined range, volume, and configuration should be properly set in accordance with the adjustment of the required cogging torque. Therefore, a single inner groove can be formed in the present invention.

The positions of the inner grooves are different according to the magnitudes of the respective reluctances of the first magnetic circuit 100 and the second magnetic circuit 101 . However, the reluctance generally differs according to the design of the small-volume power generator 20 and is common to power generators 20 of the same design. Therefore, the position of the inner groove can be tested and set during the design or prototype manufacturing process, and the inner groove can be formed at the same position whenever the same small-volume power generator 20 is manufactured.

Also, the chronograph of the present invention is not limited to a wristwatch but may be various chronographs such as desk clocks and wall clocks. Alternatively, the chronograph of the present invention may have functions other than the clock function, such as a cellular phone, a calculator, a portable personal computer, and a portable radio receiving device.

The power generator according to the present invention is not limited to be applied to chronographs, but can be applied to various electronic devices such as blood pressure monitors, portable cellular phones, PHS, pedometers, calculators, personal computers such as notebook computers, personal Organizers, PDAs (Personal Digital Assistants), portable radios, toys, IC cards, and car and house keys. In other words, the present invention can be widely applied to electronic devices that consume power. Since the cogging torque applied to the rotor 21 can be reduced so that the volume of the oscillating pendulum 25 and the powerful spring can also be reduced, and a very small volume power generator can be manufactured, the present invention can be adapted to It is widely used in various electronic devices with small volume for portable applications. Although dry batteries and chargers are commonly used in such electronic devices, installation of the power generator according to the present invention enables electronic circuits and processors (such as drive systems in electronic devices) to operate without batteries, thus, without The replacement work of the battery is required and environmental pollution can be prevented. Moreover, since power can be artificially generated by installing an oscillating pendulum and a strong spring, there is no need for charging work required for a charger, so that electronic devices can be stored outdoors or outside the home even in the event of a disaster. start up.

[experiment]

Next, experiments performed to illustrate the effects of the present invention will be described below.

In this experiment, the power generator 20 according to the first and second embodiments was used to confirm the change of the cogging torque in the presence of the inner grooves 225A and 226A by three-dimensional analysis based on the finite element method.

Incidentally, a disk-shaped samarium cobalt sintered magnet having a maximum energy product of 32 MGOe (254.7 KJ/m ³ in SI unit), and having a diameter of 1.8 mm and a thickness of 0.4 mm was used as the rotor 21 . A permalloy material (PC material) having a maximum magnetic permeability of 400000 and a saturation magnetic flux density of 0.74T was used as the stator 22, and another permalloy material having a maximum magnetic permeability of 50000 and a saturation magnetic flux density of 1.5T (PB material) was used as the magnetic core 27 .

In addition, in order to simultaneously test the influence of the gap at the connecting portion of the stator 22 and the magnetic core 27, changes in cogging torque with and without a 10 μm gap at the connecting portion were also analyzed.

The graphs in Figs. 10 to 12 show the analysis results under the above conditions. In addition, when the magnetic poles of the magnet (rotor 21 ) are oriented in the outer groove direction (direction orthogonal to the main magnetic circuit), the rotation angle is set to 0 degrees. The data 201 shown in FIG. 10 represents the cogging torque when there is no gap at the connecting portion of the stator 22 and the magnetic core 27 when the inner groove is not formed. Data 202 represents the cogging torque when there is a gap of 10 μm at the connecting portion of the stator 22 and the magnetic core 27 when no inner groove is formed.

As shown in FIG. 10, since the no-load rotor stop position of the magnet (rotor 21) is a point where the cogging torque changes between, the no-load rotor stop position is in the rotation angle of 90° in the data 201. One position, that is, in the direction (first magnetic circuit direction 100A) orthogonal to the outer groove direction, as in the first embodiment described above.

On the other hand, the no-load rotor stop position in the data 202 is a position at a rotation angle of 180°, that is, along the outer groove direction (second magnetic circuit direction 101A), as in the second embodiment described above . In other words, it can be known that the no-load rotor stop position is shifted by only 90° due to the presence of the gap at the connecting portion of the stator 22 and the magnetic core 27 even though the materials and configurations of the stator 22 and the magnetic core 27 are the same.

Also, the data 203 shown in FIG. 11 represents when the inner grooves 225A and 226A of 200 μm diameter are formed in the first magnetic circuit direction and there is no gap at the connecting portion of the stator 22 and the magnetic core 27 (as shown in FIG. 3 ). cogging torque.

The data 204 shown in FIG. 12 represents when the inner grooves 225A and 226A of 200 μm diameter are formed in the first magnetic circuit direction and there is a 10 μm gap at the connecting portion of the stator 22 and the magnetic core 27 (as shown in FIG. 5 ). Cogging torque.

As clearly shown in Figure 11, when the no-load rotor stop position is in the first magnetic circuit direction (data 201), in other words, when the reluctance of the first magnetic circuit 100 is smaller than the reluctance of the second magnetic circuit 101 , by forming the inner grooves 225A and 226A in the first magnetic circuit direction 100A at the rotor fitting hole 230, the cogging torque can be greatly reduced. For example, although the peak value of the cogging torque when the inner grooves are not formed is shown in the data 201 as 1.4*10 ^-7 (N·m), when the inner grooves 225A and 226A are formed in the data 203 The peak value of the cogging torque shown is 1.0*10 ^-8 (N·m), which is less than one-fourteenth of the peak value when there is no inner groove.

Likewise, as shown in FIG. 12, when the second magnetic circuit direction is the no-load rotor stop position (data 204), in other words, when the reluctance of the second magnetic circuit 101 is smaller than the reluctance of the first magnetic circuit 100 , by forming the inner grooves 225A and 226A in the second magnetic circuit direction 101A at the rotor fitting hole 230, the cogging torque can be greatly reduced.

Therefore, the inner groove passes through the rotor fitting hole 230 by forming the inner groove along the direction of the magnetic circuit with the smaller magnetic resistance, in other words, by making an angle of ±45° around the direction of the magnetic circuit with the smaller magnetic resistance. To the extent that an inner groove is formed on the inner periphery of the rotor fitting hole to pass through the rotation center of the rotor, the cogging torque applied to the rotor can be effectively reduced, thus confirming the effectiveness of the present invention.

Moreover, under the same conditions as the experiments shown in FIGS. 10 to 12, for the inner grooves to move ±45°, ±10° and ±0° from the first magnetic circuit direction or the second magnetic circuit direction respectively (in the magnetic circuit direction) where the cogging torque was measured. As a result, when the inner grooves are placed in an arrangement of ±0° (in the direction of the magnetic circuit), the cogging torque is maximally reduced, as shown in FIG. 13 . When the inner grooves are placed in an arrangement of ±10°, a sub-±0°, high reduction effect of the cogging torque can be seen. On the other hand, at the ±45° placement, the cogging torque is reduced by about 40% compared to the arrangement without inner grooves. As shown above, the grooves due to the adjustment of the reluctance can be effectively placed within the angular range of ±45°, and a high reduction effect can be obtained when placed at ±10°.

Claims (13)

1. power generator comprises:

Rotor has the permanent magnet that rotates by means of the rotary driving force of transmission;

Stator has the rotor mating hole that is used to place this rotor; And

Produced coil by the power on magnetic core, magnetic core constitutes magnetic circuit together with this stator and aforementioned rotor,

Wherein extend through stator and magnetic core and get back to the magnetic resistance of first magnetic circuit of rotor and its magnetic flux and be compared, form inner groovy on the inner rim of aforementioned rotor mating hole and not be used in around the magnetic resistance of second magnetic circuit of the stator closure adjacent with rotor from aforementioned rotor,

Wherein when the magnetic resistance of first magnetic circuit hour, the flow direction with the aforementioned rotor pivot of first magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form inner groovy, and

Wherein when the magnetic resistance of second magnetic circuit hour, the flow direction with the aforementioned rotor pivot of second magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form inner groovy.

2. power generator comprises:

Rotor has the permanent magnet that rotates by means of the rotary driving force of transmission;

Stator has the rotor mating hole that is used to place this rotor; And

Produced coil by the power on magnetic core, magnetic core constitutes magnetic circuit together with this stator and aforementioned rotor,

Wherein when not forming inner groovy on the inner rim at the rotor mating hole of stator former, extend through stator and magnetic core from aforementioned rotor and get back to the magnetic resistance of first magnetic circuit of rotor and be configured to less than the magnetic resistance of its magnetic flux around second magnetic circuit of the stator closure adjacent with rotor, and

Wherein the flow direction with the aforementioned rotor pivot of first magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form inner groovy.

3. power generator comprises:

Rotor has the permanent magnet that rotates by means of the rotary driving force of transmission;

Stator has the rotor mating hole that is used to place this rotor; And

Produced coil by the power on magnetic core, magnetic core constitutes magnetic circuit together with this stator and aforementioned rotor,

Wherein when not forming inner groovy on the inner rim at the rotor mating hole of stator former, its magnetic flux is configured to less than extending through the magnetic resistance that stator and magnetic core are got back to first magnetic circuit of rotor from aforementioned rotor around the magnetic resistance of second magnetic circuit of the stator closure adjacent with rotor, and

Wherein the flow direction with the aforementioned rotor pivot of second magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form inner groovy.

4. according to each power generator of claim 1 to 3, it is characterized in that, wherein inner groovy be formed on around the flow direction of the pivot of the aforementioned rotor of first magnetic circuit or second magnetic circuit ± 10 ° angular range in.

5. according to the power generator of claim 4, it is characterized in that wherein inner groovy is formed on the flow direction with the pivot of the aforementioned rotor of first magnetic circuit or second magnetic circuit.

6. power generator comprises:

Rotor has the permanent magnet that rotates by means of the rotary driving force of transmission;

Stator has the rotor mating hole that is used to place this rotor; And

Produced coil by the power on magnetic core, magnetic core constitutes magnetic circuit together with this stator and aforementioned rotor,

Wherein extend through stator and magnetic core and get back to the magnetic resistance of first magnetic circuit of rotor and its magnetic flux and be compared, and on the inner rim of aforementioned rotor mating hole, do not form ridge around the magnetic resistance of second magnetic circuit of the stator closure adjacent with rotor from aforementioned rotor,

Wherein when the magnetic resistance of first magnetic circuit is big, the flow direction with the aforementioned rotor pivot of first magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form the ridge that stretches to rotor, and

Wherein when the magnetic resistance of second magnetic circuit is big, the flow direction with the aforementioned rotor pivot of second magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form the ridge that stretches to rotor.

7. according to the power generator of claim 6, it is characterized in that, wherein ridge be formed on around the flow direction of the pivot of the aforementioned rotor of first magnetic circuit or second magnetic circuit ± 10 ° angular range in.

8. according to the power generator of claim 7, it is characterized in that wherein ridge is formed on the flow direction with the pivot of the aforementioned rotor of first magnetic circuit or second magnetic circuit.

9. according to each power generator of claim 1 to 8, it is characterized in that, also comprise: the vibration pendulum is used for rotating with user's body kinematics; And power generation wheel chain, be used for by the rotation of vibration pendulum is transferred to rotor and rotor.

10. stopwatch comprises: according to each power generator of claim 1 to 9; And be used for carrying out the processor that time showing drives by the electric energy that this power generator produces.

11. an electronic installation comprises: according to each power generator of claim 1 to 9; And the processor that drives by the electric energy that produces by this power generator.

12. a cogging torque control method that is used for power generator, this power generator comprises: rotor has the permanent magnet that rotates by means of the rotary driving force of transmission; Stator has the rotor mating hole that is used to place this rotor; And by the generation of the power on magnetic core coil, magnetic core constitutes magnetic circuit together with this stator and aforementioned rotor, and this method has following steps:

Relatively when on the inner rim of aforementioned rotor mating hole, not forming inner groovy, extend through stator and magnetic core and get back to the magnetic resistance of first magnetic circuit of rotor and its magnetic flux magnetic resistance around second magnetic circuit of the stator closure adjacent with rotor from aforementioned rotor;

When the magnetic resistance of first magnetic circuit hour, the flow direction with the pivot of the aforementioned rotor of first magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form inner groovy; And

When the magnetic resistance of second magnetic circuit hour, the flow direction with the pivot of the aforementioned rotor of second magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form inner groovy.

13. a cogging torque control method that is used for power generator, this power generator comprises: rotor has the permanent magnet that rotates by means of the rotary driving force of transmission; Stator has the rotor mating hole that is used to place this rotor; And by the generation of the power on magnetic core coil, magnetic core constitutes magnetic circuit together with this stator and aforementioned rotor, and this method has following steps:

Relatively when on the inner rim of aforementioned rotor mating hole, not forming ridge, extend through stator and magnetic core from aforementioned rotor and get back to the magnetic resistance of first magnetic circuit of rotor and its magnetic flux magnetic resistance around second magnetic circuit of the stator closure adjacent with rotor;

When the magnetic resistance of first magnetic circuit is big, the flow direction with the pivot of the aforementioned rotor of first magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form the ridge that stretches to rotor; And

When the magnetic resistance of second magnetic circuit is big, the flow direction with the pivot of the aforementioned rotor of second magnetic circuit be the center ± 45 ° angular range in, on the inner rim of the rotor mating hole of stator former, form the ridge that stretches to rotor.

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